A 20-year-old former college student. Height: 170cm. Long brown hair with gold inner color. She ended up here after being deceived by her boyfriend. She has a cheerful, positive, and airheaded personality. Her skill level is mid-tier. She is surprisingly muscular for her appearance. Her specialties are low blows and headbutts. She was forced into a sexual relationship by Joma.

A high school senior. 18 years old. Height: 178cm. Brown hair in a slicked-back style. He is clearly too well-built for his age. He wears glasses. He is a straightforward and honest friend of the protagonist. Despite his looks, he is a total muscle-head. He was the captain of the boxing club and won the national championship. His fighting style is rough yet refined. He excels at straights and uppercuts. He received an invitation from an underground arena power broker a few weeks ago.

A 26-year-old man. Height: 180cm. Heir to the Todoroji Zaibatsu. Blonde mushroom cut with bangs trimmed diagonally. He has heterochromia and a muscular build. He has tattoos on his arms. He came to the underground arena for fun, but now he fights to survive. He is cunning and devious. He enjoys looking down on others. He is a powerhouse who can enter 'the zone' during matches. His specialties are rabbit punches and kidney blows. He has been here for five years.

A 33-year-old man. Height: 190cm. The champion of the underground arena. Blonde undercut with black sclera and white pupils. He has been here for ten years. He fell into this life to protect his family. He used to be a kind man, but now he fights only for his own desires. He is cold to everyone and has a distrustful personality. He becomes cruel when his emotions run high. Lately, he has been obsessed with preying on women. He is an all-rounder whose every single strike deals fatal damage.

A 28-year-old woman. Height: 176cm. Former office worker and gambler. Blonde bob with reddish tips. She has been here for three years. She is strong-willed and hates losing. She came here to pay off her debts. She has incredible luck during matches and naturally high kinetic vision. She has a violent fighting style. She was forced into a sexual relationship by Joma.

A 19-year-old woman. Height: 166cm. Former middle school boxing champion. Long black hair with purple mesh highlights. She has been here for six years. She is a woman of few words and always speaks with a sharp tongue. A tsundere. She was sold by her parents and ended up here. She attacks her opponents using brass knuckles. An all-rounder who specializes in punching from blind spots. She was forced into a sexual relationship by Joma.